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| 1 | A method to estimate concentrations of surface-level particulate matter using satellite-based aerosol optical thickness显示文摘We propose a new method to estimate surface-level particulate matter(PM)concentrations by using satellite-retrieved Aerosol Optical Thickness(AOT).This method considers the distribution and variation of Planetary Boundary Layer(PBL)height and relative humidity(RH)at the regional scale.The method estimates surface-level particulate matter concentrations using the data simulated by an atmospheric boundary layer model RAMS and satellite-retrieved AOT.By incorporation MODIS AOT,PBL height and RH simulated by RAMS,this method is applied to estimate the surface-level PM 2.5 concentrations in North China region.The result is evaluated by using 16 ground-based observations deployed in the research region,and the result shows a good agreement between estimated PM 2.5 concentrations and observations,and the coefficient of determination R2 is 0.61 between the estimated PM 2.5 concentrations and the observations.In addition,surface-level PM 2.5 concentrations are also estimated by using MODIS AOT,ground-based LIDAR observations and RH measurements.A comparison between the two estimated PM 2.5 concentrations shows that the new method proposed in this paper is better than the traditional method.The coefficient of determination R2 is improved from 0.32 to 0.62. | TAO JinHua ZHANG MeiGen CHEN LiangFu WANG ZiFeng SU Lin GE Cui HAN Xiao ZOU MingMin | 2013 | Science China Earth Sciences2013，56，8： | 20 |
| 2 | Simulation of atmospheric aerosols in East Asia using modeling system RAMS-CMAQ:Model evaluation显示文摘The modeling system RAMS-CMAQ is applied in this paper to East Asia to simulate the temporo-spatial concentration distributions of atmo- spheric aerosols. For evaluating its performances, modeled concentrations of aerosols such as sulfate, nitrate, ammonium, black carbon and organic carbon were compared with observations obtained in East Asia on board of two aircrafts in the springtime of 2001. The comparison showed gener- ally good agreement, and, in particular, that the modeling system captured most of the important observed features, including vertical gradients of the aerosols of the Asian outflow over the western Pacific. The evaluation results provide us with much confidence for further use of the modeling system to investigate the transport and transformation processes of atmospheric aerosols over East Asia and to assess their impacts on the Earth's radiation budget. | Meigen Zhang Zhiwei Han Lingyun Zhu | 2007 | China Particuology2007，5，5： | 16 |
| 3 | Sensitivity analysis of surface ozone to emission controls in Beijing and its neighboring area during the 2008 Olympic Games显示文摘The regional air quality modeling system RAMS (Regional Atmospheric Modeling System)-CMAQ (Community Multi-scale Air Quality modeling system) is applied to analyze temporal and spatial variations in surface ozone concentration over Beijing and its surrounding region from July to October 2008.Comparison of simulated and observed meteorological elements and concentration of nitrogen oxides (NOx) and ozone at one urban site and three rural sites during Olympic Games show that model can generally reproduce the main observed feature of wind,temperature and ozone,but NOx concentration is overestimated.Although ozone concentration decreased during Olympics,high ozone episodes occurred on 24 July and 24 August with concentration of 360 and 245 μg/m 3 at Aoyuncun site,respectively.The analysis of sensitive test,with and without emission controls,shows that emission controls could reduce ozone concentration in the afternoon when ozone concentration was highest but increase it at night and in the morning.The evolution of the weather system during the ozone episodes (24 July and 24 August) indicates that hot and dry air and a stable weak pressure field intensified the production of ozone and allowed it to accumulate.Process analysis at the urban site and rural site shows that under favorable weather condition on 24 August,horizontal transport was the main contributor of the rural place and the pollution from the higher layer would be transported to the surface layer.On 24 July,as the wind velocity was smaller,the impact of transport on the rural place was not obvious. | Yi Gao Meigen Zhang | 2012 | Journal of Environmental Sciences2012，24，1： | 13 |
| 4 | Local and long-range transport influences on PM_(2.5) at a cities-cluster in northern China,during summer 2008显示文摘Hourly PM2.5 concentrations were observed simultaneously at a cities-cluster comprising 10 cities/towns in Hebei province in China from July 1 to 31,2008. Among the 10 cities/towns, Baoding showed the highest average concentration level(161.57(jig/m3) and Yanjiao exhibited the lowest(99.35(jig/m3). These observed data were also studied using the joint potential source contribution function with 24-h and72-h backward trajectories, to identify more clearly the local and countrywide-scale long-range transport sources. For the local sources, three important influential areas were found, whereas five important influential areas were defined for long-range transport sources. Spatial characteristics of PM2.5 were determined by multivariate statistical analyses. Soil dust, coal combustion, and vehicle emissions might be the potential contributors in these areas. The results of a hierarchical cluster analysis for back trajectory endpoints and PM2.5 concentrations datasets show that the spatial characteristics of PM2.5 in the cities-cluster were influenced not only by local sources, but also by long-range transport sources. Different cities in the cities-cluster obtained different weighted contributions from local or long-range transport sources. Cangzhou, Shijiazhuang, and Baoding are near the source areas in the south of Hebei province,whereas Zhuozhou, Yangfang, Yanjiao, Xianghe, and Langfang are close to the sources areas near Beijing and Tianjin. | Lijie Gao Yingze Tian Caiyan Zhang Guoliang Shi Huize Hao Fang Zeng Chunli Shi Meigen Zhang Yinchang Feng Xiang Li | 2014 | Particuology2014，12，2： | 9 |
| 5 | Model analysis of aerosol optical depth distributions over East Asia显示文摘Based on simulated major aerosol concentrations (e.g., sulfate, nitrate, ammonium, organic carbon, black carbon, and sea salt) over East Asia during the year 2005 by using the Multi-scale Air Quality modeling system (RAMS-CMAQ), the aerosol optical depth (AOD) was calculated by the reconstruction mass-extinction method and then analyzed to explore its characteristics in temporal-spatial distributions. For evaluating the model performances, simulated AOD values were compared against observations at stations of the Aerosol Robotic Network (AERONET) and the Chinese Sun Hazemeter Network (CSHNET). The comparison shows that the model can well reproduce observed temporal and spatial features of AOD, especially in natural en- vironment. However, the simulated AOD values are underestimated over urban and suburban regions with dense human activities. Analysis of simulation results indicates that AOD varies significantly in time and space, and generally, AOD values are lower in summer and higher in winter. Excluding the contribution from soil dust aerosols, high AOD values (over 0.8) are found over the Sichuan Basin, South China, and Central China in several months, while low values (less than 0.2) are over northern and western areas of East Asia and southern sea regions. Analysis also shows that aerosols such as sulfate, nitrate, and ammonium are main contributors to AOD in East Asia, and their contributions are over 80% in most high AOD areas, while black carbon aerosols play an important role in northern China where dense human activities exist, especially in the winter time. | HAN Xiao ZHANG MeiGen HAN ZhiWei XIN JinYuan WANG LiLi QIU JinHuan LIU YanJu | 2010 | Science China Earth Sciences2010，53，7： | 9 |
| 6 | 中国近地面臭氧来源解析研究综述显示文摘近年来,在实施了一系列较为严格的空气污染控制措施后,中国的PM2.5污染已得到明显改善,但近地面臭氧污染问题却日益凸显,尤其是在一些发达的城市群,如京津冀,长三角,珠三角和四川盆地地区。鉴于臭氧生成的复杂性及其与前体物的非线性关系,准确定位臭氧及其前体物的来源是制定经济高效的臭氧污染控制策略的重要前提。本文总结了近20年来国内外已发表文章中关于中国臭氧来源(包括区域和行业来源)的主要方法 (包括基于观测的方法和基于排放的方法)和结论,希望能为中国臭氧污染的全面了解和空气污染防治政策的制定提供可靠的参考。 | LIU Hailing ZHANG Meigen HAN Xiao | 2020 | Atmospheric and Oceanic Science Letters2020，13，5： | 9 |
| 7 | A new kind of optimal second-order symplectic scheme for seismic wave simulations显示文摘Here we introduce generalized momentum and coordinate to transform seismic wave displacement equations into Hamiltonian system.We define the Lie operators associated with kinetic and potential energy,and construct a new kind of second order symplectic scheme,which is extremely suitable for high efficient and long-term seismic wave simulations.Three sets of optimal coefficients are obtained based on the principle of minimum truncation error.We investigate the stability conditions for elastic wave simulation in homogeneous media.These newly developed symplectic schemes are compared with common symplectic schemes to verify the high precision and efficiency in theory and numerical experiments.One of the schemes presented here is compared with the classical Newmark algorithm and third order symplectic scheme to test the long-term computational ability.The scheme gets the same synthetic surface seismic records and single channel record as third order symplectic scheme in the seismic modeling in the heterogeneous model. | LIU ShaoLin LI XiaoFan WANG WenShuai LIU YouShan ZHANG MeiGen ZHANG Huan | 2014 | Science China Earth Sciences2014，57，4： | 8 |
| 8 | Earthquake Response and Isolation Layer Parameter Effect of Seismic Isolation Systems of Transformers With Bushings显示文摘国内外震害表明,变压器在地震中的破坏型式多样,易损性极高。隔震技术是一项能够有效降低地震反应的新型抗震技术,而变压器及套管隔震层的设计和参数选择与普通结构有较大的差异。首先,建立了大型电力变压器及套管隔震体系的多质点分析模型,采用Matlab软件编写计算程序,分别输入人工地震波和Taft地震波,对变压器及套管隔震体系的地震响应进行分析;最后,开展了隔震层等效水平网0度、等效阻尼比、双线性恢复力模型的屈服剪力系数及屈服后刚度等参数的地震响应影响分析。分析结果表明:合理设计变压器及套管隔震体系的隔震层参数,可有效降低变压器及套管的地震响应;另外,通过隔震层的参数分析,得到了相关参数的合理取值范围。该研究对今后变压器及套管隔震体系的设计具有参考与指导作用。 | CAO Meigen ZHOU Fulin TAN Ping ZHANG Guangping GAO Zhengguo | 2012 | 中国电机工程学报2012，32，13： | 4 |
| 9 | Assessment of the Biospheric Contribution to Surface Atmospheric CO_2 Concentrations over East Asia with a Regional Chemical Transport Model显示文摘A regional chemical transport model, RAMS-CMAQ, was employed to assess the impacts of biosphere–atmosphere CO2 exchange on seasonal variations in atmospheric CO2 concentrations over East Asia. Simulated CO2 concentrations were compared with observations at 12 surface stations and the comparison showed they were generally in good agreement. Both observations and simulations suggested that surface CO2 over East Asia features a summertime trough due to biospheric absorption, while in some urban areas surface CO2 has a distinct summer peak, which could be attributed to the strong impact from anthropogenic emissions. Analysis of the model results indicated that biospheric fluxes and fossil-fuel emissions are comparably important in shaping spatial distributions of CO2 near the surface over East Asia. Biospheric flux plays an important role in the prevailing spatial pattern of CO2 enhancement and reduction on the synoptic scale due to the strong seasonality of biospheric CO2 flux. The elevation of CO2 levels by the biosphere during winter was found to be larger than 5ppm in North China and Southeast China, and during summertime a significant depletion( 7 ppm) occurred in most areas,except for the Indo-China Peninsula where positive bioflux values were found. | KOU Xingxia ZHANG Meigen PENG Zhen WANG Yinghong | 2015 | Advances in Atmospheric Sciences2015，32，3： | 4 |
| 10 | NUMERICAL SIMULATION WITH A COMPREHENSIVE CHEMICAL TRANSPORT MODEL OF NITRATE,SULFATE,AND AMMONIUM AEROSOL DISTRIBUTIONS OVER EAST ASIA显示文摘The transport and chemical production processes of nitrate, sulfate, and ammonium aerosols over East Asia were investigated by use of the Models-3 Community Multi-scale Air Quality (CMAQ) modeling system coupled with the Regional Atmospheric Modeling System (RAMS). For the evaluation of the model's ability in depicting their3-dimensional concentration distributions and temporal variations, modeled concentrations of nitrate, sulfate, and ammonium aerosols are compared with the observations obtained at a ground station in Japan in March 2001 and onboard of an aircraft DC-8 on 18 and 21 March 2001 during the Transport and Chemical Evolution over the Pacific (TRACE-P)field campaign. Comparison shows that simulated values of nitrate, sulfate, and ammonium aerosols are generally in good agreement with their observed data, and the model captures most important observed features, and reproduces temporal and spatial variations of nitrate, sulfate, and ammonium aerosol concentrations reasonably well, e.g., the timing and locations of the concentration spikes of nitrate, sulfate, and ammonium aerosols are well reproduced, but large discrepancies between observed and simulated values are also clearly seen at some points and some times due to the coarse grid resolution and uncertainties of the emissions used in this study. This comparison results indicate that CMAQ is able to simulate the distributions of nitrate, sulfate, and ammonium aerosols and their related species in the troposphere over East Asia reasonably well. | Meigen Zhang | 2005 | China Particuology2005，3，5： | 3 |
| 11 | Accounting for CO2 Variability over East Asia with a Regional Joint Inversion System and Its Preliminary Evaluation显示文摘A regional surface carbon dioxide(CO_2) flux inversion system, the Tan-Tracker-Region, was developed by incorporating an assimilation scheme into the Community Multiscale Air Quality(CMAQ) regional chemical transport model to resolve fine-scale CO_2 variability over East Asia. The proper orthogonal decomposition-based ensemble four-dimensional variational data assimilation approach(POD-4 DVar) is the core algorithm for the joint assimilation framework, and simultaneous assimilations of CO_2 concentrations and surface CO_2 fluxes are applied to help reduce the uncertainty in initial CO_2 concentrations. A persistence dynamical model was developed to describe the evolution of the surface CO_2 fluxes and help avoid the 'signal-to-noise' problem; thus, CO_2 fluxes could be estimated as a whole at the model grid scale, with better use of observation information. The performance of the regional inversion system was evaluated through a group of single-observation-based observing system simulation experiments(OSSEs). The results of the experiments suggest that a reliable performance of Tan-Tracker-Region is dependent on certain assimilation parameter choices, for example, an optimized window length of approximately 3 h, an ensemble size of approximately 100, and a covariance localization radius of approximately 320 km. This is probably due to the strong diurnal variation and spatial heterogeneity in the fine-scale CMAQ simulation, which could affect the performance of the regional inversion system. In addition, because all observations can be artificially obtained in OSSEs, the performance of Tan-Tracker-Region was further evaluated through different densities of the artificial observation network in different CO_2 flux situations. The results indicate that more observation sites would be useful to systematically improve the estimation of CO_2 concentration and flux in large areas over the model domain. The work presented here forms a foundation for future research in which a thorough estimation of CO_2 flux variability over East Asia could be performed with the regional inversion system. | xingxia kou xiangjun tian meigen zhang zhen peng xiaoling zhang | 2017 | Journal of Meteorological Research2017，31，5： | 2 |
| 12 | The Interannual Variation of Transboundary Contributions from Chinese Emissions of PM_(2.5)to South Korea显示文摘In recent years,several studies pointed out that anthropogenic emission sources in China which significantly contribute to the PM_(2.5)mass burden was an important cause of particulate pollution in South Korea.However,most studies generally focused upon a single pollution event.It is rare to see comprehensive research that captures those features prone to interannual variations concerning the transboundary pollutant contribution in South Korea using a unified method.In this paper,we establish the emission inventories covering East Asia in 2010,2015,and 2017,and then conduct the source apportionment by applying a coupled regional air quality model called the Integrated Source Apportionment Module(ISAM).Comparison of simulated and observed PM_(2.5)mass concentration at 165 CNEMC(China National Environmental Monitoring Center)sites suggests that the PM_(2.5)concentrations are well represented by the modeling system.The model is used to quantitatively investigate the contribution from emission sources in China to PM_(2.5)concentrations over South Korea and those features found to be prone to interannual variations are then discussed.The results show that the average annual contribution of PM_(2.5)has dropped significantly from 28.0%in 2010 to 15.7%in 2017,which strongly suggests that China has achieved remarkable results in the treatment of atmospheric particulates. | Xiao HAN Meigen ZHANG | 2021 | Advances in Atmospheric Sciences2021，38，5： | 2 |
| 13 | Modeling nitrate aerosol distributions and its direct radiative forcing in East Asia with RAMS-CMAQ显示文摘The geographical and seasonal characteristics in nitrate aerosol and its direct radiative forcing over East Asia are analyzed by using the air quality modeling system RAMS-CMAQ coupled with an aerosol optical properties/radiative transfer module.For evaluating the model performance,nitrate ion concentration in precipitation,and mixing ratios of PM_(10),and some gas precursors of aerosol during the whole year of2007 are compared against surface observations at 17 stations located in Japan.Korea,and China,and the satellite retrieved NO_2 columns.The comparison shows that the simulated values are generally in good agreement with the observed ones.Simulated monthly averaged values are mostly within a factor of 2of the measurements at the observation stations.The distribution patterns of NO_2 from simulation and satellite measurement are also similar with each other.Analysis of the distribution features of monthly and yearly averaged mass concentration and direct radiative forcing(DRF) of nitrate indicates that the nitrate aerosol could reach about 25-30%of the total aerosol mass concentration and DRF in Sichuan Basin,Southeast China,and East China where the high mass burden of all major aerosols concentrated.The highest mass concentration and strongest DRF of nitrate could exceed 40μg/m^3 and-5W/m^2,respectively.It also indicates that other aerosol species,such as carbonaceous and mineral particles,could obviously influence the nitrate DRF for they are often internally mixed with each other. | Xiao Han Meigen Zhang Baorong Zhou | 2013 | Particuology2013，11，3： | 2 |
| 14 | Simulation of nitrate aerosol concentrations over East Asia with the model system RAMS: CMAQ显示文摘 | ZHANG Meigen GAO Lijie GE Cui | 2007 | Tellus2007，59，： | 1 |
| 15 | Development of CMAQ for East Asia CO_2 data assimilation under an EnKF framework: a first result显示文摘Under an Ensemble Kalman Filter(EnKF)framework,Regional Atmospheric Modeling System and Models-3 Community Multi-scale Air Quality(RAMS–CMAQ)modeling system is developed to be a CO2data assimilation system EnKF–CMAQ,and the EnKF–CMAQ system is then applied to East Asia for validation with real continuous surface CO2concentration observations available in the study domain instead of using an observation simulation system experiment.Experiments with an experimental period of January 23 to February 7,2007 are conducted,and the experimental results of the EnKF–CMAQ system and the RAMS–CMAQ model are compared against continuous surface CO2observations from assimilation sites and independent reference sites.Distributions of daily mean CO2concentration increments show that the EnKF–CMAQ system confines the update of daily mean CO2within areas nearby and downwind of the assimilation sites.Both the CO2concentration ensemble spreads and background error covariances show flow-dependent patterns.The results indicate the crucial role of wind transport in the CO2data assimilation,which agrees with the previous studies.The average bias and the average root-mean-square error(RMSE)of daily mean CO2concentration at the assimilation sites are reduced by 1.00 and1.83 ppm,respectively,and those at the reference sites are reduced by 0.24 and 0.22 ppm,respectively.The results demonstrate the EnKF–CMAQ system is capable of assimilating the continuous surface CO2concentration observations to improve the simulation accuracy of the atmospheric CO2synoptic variation.Since growing CO2observations over East Asia are being available nowadays,this work is our first step to generate consistent spatial and temporal atmospheric CO2concentration fields over East Asia,particularly over China,using both in situ and satellite observations. | Zhekun Huang Zhen Peng Hongnian Liu Meigen Zhang Xiaoguang Ma Shu-Chih Yang Sang-Deok Lee Seung-Yeon Kim | 2014 | Chinese Science Bulletin2014，59，25： | 1 |
| 16 | Evaluation of the Models-3 Community Multi-scale Air Quality (CMAQ) modeling system with observations obtained during the TRACE-P experiment comparison of ozone and its related species显示文摘 | Meigen Zhang Itsushi Unob Renjian Zhang | 2006 | Atmospheric Environment2006，40，： | 1 |
| 17 | Chemical characteristics and source apportionment of PM 10 during Asian dust storm and non-dust storm days in Beijing显示文摘 | Qingyang Liu Yanju Liu Jianxin Yin Meigen Zhang Tingting Zhang | 2014 | Atmospheric Environment2014，，： | 1 |
| 18 | Transport and transformation of sulfur compounds over East Asia during the TRACE-P and ACE-Asia campaigns显示文摘 | ZHANG Meigen UNO I YOSHIDA Y | 2004 | Atmospheric Environment2004，38，40： | 1 |
| 19 | 显示文摘 | Zhang Zhian Yang Bangchao Deng Meigen | 2004 | Acta Chimica Sinica2004，62，17： | 1 |
| 20 | Simulation of nitrate aerosol concentrations over East Asia with the model system RAMSCMAQ显示文摘 | ZHANG Meigen GAO Lijie GE Cui | 2007 | Tellus2007，59，： | 1 |
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